The Basics
- Nextcloud Server version (e.g., 29.x.x):
31.0.2
- Operating system and version (e.g., Ubuntu 24.04):
AIO v10.9.0
- Web server and version (e.g, Apache 2.4.25):
Latest Apache Docker container
- Reverse proxy and version _(e.g. nginx 1.27.2)
NGINX Proxy Manager v2.12.3
- PHP version (e.g, 8.3):
Latest AIO Containers
- Is this the first time you’ve seen this error? (Yes / No):
Yes
- When did this problem seem to first start?
since the beginning
- Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
AIO
- Are you using CloudfIare, mod_security, or similar? (Yes / No)
Cloudflare proxy for external access but this issue happens internally when using the web GUI at cloud.domain.tld which is processed through NPM
Summary of the issue you are facing:
SMTP server is configured in Basic Settings and Test E-Mails work. Using Fastmail as the provider with STARTLS.
Mail Providers is set to System email account
Steps to replicate it (hint: details matter!):
- Create calendar event
- Add attendee by e-mail address
- Save event
- Go back to event and look at attendee list. Invitee status is “Failed to deliver invitation”
Log entries
{{"reqId":"FQTkC8hUphyYhDMUIcP3","level":3,"time":"2025-04-02T15:29:03+00:00","remoteAddr":"172.69.65.40","user":"user","app":"dav","method":"PUT","url":"/remote.php/dav/calendars/user/personal/61447C4D-4FBF-4F15-B612-67644EF1A467.ics","message":"Unable to deliver message to inviteduser@gmail.com","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36 Edg/134.0.0.0","version":"31.0.2.1","data":{"app":"dav"},"id":"67ed5c5a25d4b"}
Configuration
Nextcloud
The output of occ config:list system or similar is best, but, if not possible, the contents of your config.php file from /path/to/nextcloud is fine (make sure to remove any identifiable information!):
{
"system": {
"one-click-instance": true,
"one-click-instance.user-limit": 100,
"memcache.local": "\\OC\\Memcache\\APCu",
"apps_paths": [
{
"path": "\/var\/www\/html\/apps",
"url": "\/apps",
"writable": false
},
{
"path": "\/var\/www\/html\/custom_apps",
"url": "\/custom_apps",
"writable": true
}
],
"check_data_directory_permissions": false,
"memcache.distributed": "\\OC\\Memcache\\Redis",
"memcache.locking": "\\OC\\Memcache\\Redis",
"redis": {
"host": "***REMOVED SENSITIVE VALUE***",
"password": "***REMOVED SENSITIVE VALUE***",
"port": 6379
},
"overwritehost": "cloud.domain.tld",
"overwriteprotocol": "https",
"passwordsalt": "***REMOVED SENSITIVE VALUE***",
"secret": "***REMOVED SENSITIVE VALUE***",
"trusted_domains": [
"localhost",
"cloud.domain.tld"
],
"datadirectory": "***REMOVED SENSITIVE VALUE***",
"dbtype": "pgsql",
"version": "31.0.2.1",
"overwrite.cli.url": "https:\/\/cloud.domain.tld\/",
"dbname": "***REMOVED SENSITIVE VALUE***",
"dbhost": "***REMOVED SENSITIVE VALUE***",
"dbport": "",
"dbtableprefix": "oc_",
"dbuser": "***REMOVED SENSITIVE VALUE***",
"dbpassword": "***REMOVED SENSITIVE VALUE***",
"installed": true,
"instanceid": "***REMOVED SENSITIVE VALUE***",
"maintenance": false,
"updatedirectory": "\/nc-updater",
"loglevel": 2,
"app_install_overwrite": [
"nextcloud-aio"
],
"log_type": "file",
"logfile": "\/var\/www\/html\/data\/nextcloud.log",
"log_rotate_size": 10485760,
"log.condition": {
"apps": [
"admin_audit"
]
},
"preview_max_x": 2048,
"preview_max_y": 2048,
"jpeg_quality": 60,
"enabledPreviewProviders": {
"1": "OC\\Preview\\Image",
"2": "OC\\Preview\\MarkDown",
"3": "OC\\Preview\\MP3",
"4": "OC\\Preview\\TXT",
"5": "OC\\Preview\\OpenDocument",
"6": "OC\\Preview\\Movie",
"7": "OC\\Preview\\Krita",
"0": "OC\\Preview\\Imaginary",
"23": "OC\\Preview\\ImaginaryPDF"
},
"enable_previews": true,
"upgrade.disable-web": true,
"mail_smtpmode": "smtp",
"trashbin_retention_obligation": "auto, 30",
"versions_retention_obligation": "auto, 30",
"activity_expire_days": 30,
"simpleSignUpLink.shown": false,
"share_folder": "\/Shared",
"one-click-instance.link": "https:\/\/nextcloud.com\/all-in-one\/",
"upgrade.cli-upgrade-link": "https:\/\/github.com\/nextcloud\/all-in-one\/discussions\/2726",
"maintenance_window_start": 100,
"allow_local_remote_servers": true,
"davstorage.request_timeout": 3600,
"documentation_url.server_logs": "https:\/\/github.com\/nextcloud\/all-in-one\/discussions\/5425",
"htaccess.RewriteBase": "\/",
"dbpersistent": false,
"auth.bruteforce.protection.enabled": true,
"ratelimit.protection.enabled": true,
"files_external_allow_create_new_local": false,
"trusted_proxies": "***REMOVED SENSITIVE VALUE***",
"preview_imaginary_url": "***REMOVED SENSITIVE VALUE***",
"preview_imaginary_key": "***REMOVED SENSITIVE VALUE***",
"mail_smtpauth": true,
"mail_sendmailmode": "smtp",
"mail_smtphost": "***REMOVED SENSITIVE VALUE***",
"mail_smtpport": "587",
"mail_from_address": "***REMOVED SENSITIVE VALUE***",
"mail_domain": "***REMOVED SENSITIVE VALUE***",
"mail_smtpname": "***REMOVED SENSITIVE VALUE***",
"mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
"default_phone_region": "US",
"DOMAIN": "cloud.domain.tld"
}
}```
#### Apps
Enabled:
- activity: 4.0.0
- admin_audit: 1.21.0
- bruteforcesettings: 4.0.0
- calendar: 5.2.0
- circles: 31.0.0
- cloud_federation_api: 1.14.0
- comments: 1.21.0
- contacts: 7.0.4
- contactsinteraction: 1.12.0
- dashboard: 7.11.0
- dav: 1.33.0
- deck: 1.15.0
- federatedfilesharing: 1.21.0
- federation: 1.21.0
- files: 2.3.1
- files_downloadlimit: 4.0.0
- files_fulltextsearch: 31.0.0
- files_pdfviewer: 4.0.0
- files_reminders: 1.4.0
- files_sharing: 1.23.1
- files_trashbin: 1.21.0
- files_versions: 1.24.0
- firstrunwizard: 4.0.0
- fulltextsearch: 31.0.0
- fulltextsearch_elasticsearch: 31.0.0
- logreader: 4.0.0
- lookup_server_connector: 1.19.0
- nextcloud-aio: 0.7.0
- nextcloud_announcements: 3.0.0
- notes: 4.11.0
- notifications: 4.0.0
- notify_push: 1.0.0
- oauth2: 1.19.1
- password_policy: 3.0.0
- photos: 4.0.0-dev.1
- privacy: 3.0.0
- profile: 1.0.0
- provisioning_api: 1.21.0
- recommendations: 4.0.0
- related_resources: 2.0.0
- serverinfo: 3.0.0
- settings: 1.14.0
- sharebymail: 1.21.0
- support: 3.0.0
- survey_client: 3.0.0
- systemtags: 1.21.1
- tasks: 0.16.1
- text: 5.0.0
- theming: 2.6.1
- twofactor_backupcodes: 1.20.0
- twofactor_totp: 13.0.0-dev.0
- user_oidc: 7.1.0
- user_status: 1.11.0
- viewer: 4.0.0
- weather_status: 1.11.0
- webhook_listeners: 1.2.0
- whiteboard: 1.0.5
- workflowengine: 2.13.0
Disabled:
- app_api: 5.0.2 (installed 5.0.2)
- encryption: 2.19.0
- files_external: 1.23.0
- suspicious_login: 9.0.1
- twofactor_nextcloud_notification: 5.0.0
- user_ldap: 1.22.0